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Observe the given figures A… (Class 10 Science 2025, Q8)

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ScienceCBSE Class 10 · Board exam 2025, set 31/2/1 · 1 mark · MCQ

CBSE Class 10 Science 2025: question 8

Set in the CBSE Class 10 board exam of 2025, paper 31/2/1, section A, question 8, for 1 mark. Try it first; the hints and our step-by-step solution are below.

Q8 · 1 mark · MCQControl and Coordination

Observe the given figures A and B. When chhui-mui (sensitive) plant is touched, its leaves fold. This is due to :

  1. (A)Hormonal effect
  2. (B)Thermal effect
  3. (C)Change in amount of water in cells
  4. (D)Electromagnetic effect

Figure in the paper: Figure A shows a chhui-mui (sensitive plant) with its pinnate leaves spread open. Figure B shows the same plant after being touched, with its leaflets folded together and drooping. See it in the official paper.

Source: official question paper from cbse.gov.in (PDF). See it in the full 2025 board paper, set 31/2/1.

Hints

Open one hint at a time and try again before the next.

Hint 1

This movement is quick and does not involve growth.

Hint 2

How do plant cells change their shape?

Step-by-step solution

Each step shows the marks it earns, as an examiner would award them. Checked by an independent re-solve from the question paper.

  1. The leaves of the sensitive plant fold immediately on touch, with no growth involved.

  2. Plant cells pass the stimulus from cell to cell and then change shape by changing the amount of water in them. This causes the leaves to fold.

  3. So the answer is (C), change in amount of water in cells.

    1 mark

Answer: (C) Change in amount of water in cells

Where the marks are

  • Chooses change in water content of cells, option (C) (1 mark)

Revise the chapter

Practise this chapterBoard-style questions from Control and Coordination, one at a time, marked against the answer key and marking points.Back to the full paper2025 board paper, set 31/2/1: every question, by section.

The question is transcribed from the official paper; figures are described in words. The solution, hints and chapter tag are ours. Spotted an error? Write tosupport@questionbuddy.in.